Definitely worth the investment!

I highly recommend taking the class if you’ve got the funds for it. Manhattan Prep was invaluable in teaching me core strategies that helped drive my score from 620 (First CAT) to 750 (actual exam 2nd attempt). Even though I was targeting a very high score (750+), the class and the materials provided were all that I needed to reach my goal score. Signing up for a class comes with:
• Syllabus and homework schedule
• Copy of the latest Official GMAT guides
• Manhattan Prep strategy guides - which cover all the content that could come up during the real exam
• Access to plethora of online resources, such as 6 CAT exams (great for tracking progress), online office hours, performance analytics (helping in identifying strengths and weaknesses), Post-Exam Assessment, etc
I found the classes themselves engaging and well-structured. The instructors are passionate about teaching, are experienced, and have scored in the 99th percentile. I took the Sunday class with Laurel Hanson, who was great at keeping me engaged through each 3 hour class (not an easy thing to do!), and offered useful strategies to reduce exam stress and fatigue and master content.
While the classes are very useful, reaching your goal score may take some self-studying, as you identify weaknesses and areas of improvement while working through the syllabus and taking practice CATs. I spent several months self-studying after the class and scored a 720 (Q50 V38), which was close to my target score, but not quite there.
I went back to Manhattan Prep and signed up for a Post-Exam Assessment, which is included if you took a class. After filling out a questionnaire about my exam experience and study habits, Manhattan Prep put me in touch with instructor Jamie Nelson, who came up with a new study plan that was specific to my strengths and weaknesses and offered additional strategies to maintain my quant score and improve verbal. I kept to my new personalized study plan, and a month later, I took the exam a second time and scored 750 (Q50 V42).
The great thing about Manhattan Prep is even if you’ve finished the classes, you will still have the support of the instructors and resources to guide you through your GMAT preparation until you reach your goal.
Again, I strongly recommend going with Manhattan Prep if you’re deciding on a course to take. Great instructors, invaluable test-taking strategies, and pretty much everything you need if you’re targeting a high score.